1 /* 2 * Copyright (c) 2015-2017 François Tigeot 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUX_KTIME_H_ 28 #define _LINUX_KTIME_H_ 29 30 #include <linux/time.h> 31 #include <linux/jiffies.h> 32 33 /* time values in nanoseconds */ 34 union ktime { 35 int64_t tv64; 36 }; 37 38 typedef union ktime ktime_t; 39 40 static inline ktime_t 41 ktime_set(const s64 secs, const unsigned long nsecs) 42 { 43 ktime_t kt; 44 45 kt.tv64 = secs * NSEC_PER_SEC + (s64)nsecs; 46 return kt; 47 } 48 49 static inline s64 50 ktime_to_us(const ktime_t kt) 51 { 52 return kt.tv64 / NSEC_PER_USEC; 53 } 54 55 static inline s64 56 ktime_us_delta(const ktime_t later, const ktime_t earlier) 57 { 58 return later.tv64 - earlier.tv64; 59 } 60 61 static inline int64_t ktime_to_ns(ktime_t kt) 62 { 63 return kt.tv64; 64 } 65 66 static inline struct timeval ktime_to_timeval(ktime_t kt) 67 { 68 return ns_to_timeval(kt.tv64); 69 } 70 71 static inline ktime_t ktime_add_ns(ktime_t kt, int64_t ns) 72 { 73 ktime_t res; 74 75 res.tv64 = kt.tv64 + ns; 76 return kt; 77 } 78 79 static inline ktime_t ktime_sub_ns(ktime_t kt, int64_t ns) 80 { 81 ktime_t res; 82 83 res.tv64 = kt.tv64 - ns; 84 return kt; 85 } 86 87 static inline ktime_t ktime_get(void) 88 { 89 struct timespec ts; 90 ktime_t kt; 91 92 nanouptime(&ts); 93 kt.tv64 = (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec; 94 return kt; 95 } 96 97 #include <linux/timekeeping.h> 98 99 #endif /* _LINUX_KTIME_H_ */ 100